Could I have a camera complete an animation then follow a path?
With your camera selected, go to Properties -> Constraints. Add 2 'Child-Of' constraints to the camera. In the first Child-Of constraint, make the target your car. In the second Child-Of constraint, make the target a static object in the scene, such as the ground model.  

Go to the last frame in which the camera needs to follow the car. Set the first Child-Of influence to 1.0 and keyframe it (hit I over the influence bar). Then set the second Child-Of influence to 0.0 and keyframe it.   

Go to the very next frame. Set the first Child-Of influence to 0.0 and keyframe it. Set the second Child-Of influence to 1.0 and keyframe it.
Now you are free to animate the camera with respect to the moving car. Then, you can animate the camera with respect to the scene in general.